Thanks so much - I realise now that the documentation I should have been
reading was:
http://www.sqlalchemy.org/docs/orm/relationships.html#backref-arguments
Ben
On 31 August 2011 22:50, Michael Bayer mike...@zzzcomputing.com wrote:
dependency rule tried to blank out primary key means:
1.
Hi,
I'm still having troubles correctly figuring my various many-to-many
relations. Originally, this was a 'standard' many-to-many; that is, a
secondary table was specified.
However, I now need to add further information to the relation and am
converting into an AssociationObject. My problem is
dependency rule tried to blank out primary key means:
1. A references B, B has a foreign key to A.
2. A is deleted.
3. each B associated with A must therefore have the foreign key of A set to
NULL (this is the default behavior if 'delete' cascade isn't configured).
4. the foreign key on B is
